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Anyone that's rebuild or replaced their M54 dual vanos, I am wondering if it's a wash of cost vs. aggravation to actually open up the unit and replace seals/bearings through Beisan ($120 for bearings and o-rings, plus teflon seals, vc gaskets and bolt grommets for another $60, so a minimum of $180 plus time and labor) or get the Dr. Vanos rebuilt unit for $250.

How much time and effort is involved in actually rebuilding your own core, and did you find it to be worth the $70 you saved?

You'll save more than that. You don't need to install the bearings (unless you're installing ZHP or Schrick cams). The teflon seals are quite simple to do. It's an easy DIY and you get to take junk apart. Fun times!